data.table v1.5.1

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by M Dowle

Extension of data.frame for fast subset, fast merge and fast grouping.

Enhanced data.frame. Fast subset, grouping and merge in a short and flexible syntax. i and j may be expressions of column names directly, for faster development. Example: X[Y] is a fast join for large data.

Functions in data.table

Name Description
duplicated Determine Duplicate Rows
Extract.data.table Query a data table
merge Merge Two Data Tables
between Convenience function for range subset logic.
J Creates a Join data table
like Convenience function for calling regexpr.
data.table Enhanced data.frame
transform.data.table Data table utilities
IDateTime Integer based date class
test.data.table Runs a set of tests.
timetaken Pretty print of time taken
tables Display all objects of class 'data.table'
setkey Create key on a data table
last Last item of an object
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Details

License GPL
URL http://datatable.r-forge.r-project.org/
Packaged 2011-01-07 01:07:22 UTC; mdowle
Repository CRAN
Date/Publication 2011-01-08 08:31:24

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